Replacement blades are necessary for box cutter knives. High-grade blades do not just enhance productivity but also lower costs. Easy Cut 5000/6000 Replacement Box Cutter Safety Blades are made from the finest quality steel. These blades last up to three times longer than regular blades. A box of Easy Cut 5000/6000 Blades contains exclusively designed blades with a patented radius tip that helps prevent product damage and injury during box cutting. The blades are resilient, strong, and extremely sharp. They do not chip and give a sharp edge to cut up to 5000 feet. They can also quickly and neatly slice through cardboard boxes for efficient and seamless opening.